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The speed voltage signal given by the numerical control is integrated with the output value of the speed measuring motor and the feedback value of the current loop. The integral value is input to the voltage loop to generate a command for changing the pulse width. The command is input to the modulation circuit for PwM modulation, and the modulation signal is input. Drive module EXE841, IGBT power module is driven by EXB841 and protected by overcurrent and overvoltage.
The operating current is detected by a Hall current sensor. Adjust the pulse width of the gate drive voltage to adjust the output peak. Main Power Circuit The main power circuit of the spindle DC servo drive adopts an H-bridge structure, and the basic structure diagram of the main power circuit can effectively reduce the turn-on loss.
The drive circuit drive circuit uses a hybrid integrated drive chip EXB841 manufactured by Fujifilm, and the drive circuit is as shown. The driver chip is powered by a single 20V DC power supply. It detects whether T is overcurrent through D1, outputs a fault signal at pin 5, and sends the fault signal back to the control circuit through photoelectric coupling. The control circuit prohibits input and automatically reduces the gate drive voltage. , realize the soft turn-off of IGEr, the response time is sus, if the load short circuit disappears, the gate drive voltage is automatically restored, and IG-BT is turned on.
The value of the gate drive resistor Rg determines the steepness and switching loss of the front and rear edges of the gate control pulse. Balanced resistor R2 of gate, emitter gate and emitter avoids IGBI, gate triangle wave generating circuit unloading circuit IGBT speed given proportional integral circuit voltage loop PWM switching logic circuit circuit driving speed feedback circuit working current detecting circuit current loop circuit The block diagram of the input control circuit is disabled as shown.
When the output is a positive voltage, the power tube, T4 is turned on, and the dish and T3 are turned off. When the output is a negative voltage, the power tube hole and the bamboo are turned on, and Tl and T4 are turned off; the through-electrode is broken. D3, D4 avoid overvoltages at the gate and emitter. The principle block diagram of the control circuit control circuit gives a speed pulse signal to eliminate the pulsation shock through the equalization circuit integration, and the speed feedback signal and the current feedback signal input the proportional integration circuit to obtain the speed deviation signal, and the input voltage loop generates an instruction for changing the pulse width. The triangular wave modulation of the 3SK peak 3.SKHZ frequency generated by the triangular wave generating circuit generates a PWM signal of the peak frequency of 3.SKHZ of 20V, and is sent to the switching logic circuit and the inhibit signal logic and the input driver circuit to drive the IGBT switch.
The fault signal of the drive circuit is forbidden by the circuit and the tank circuit. The output of the logic circuit is prohibited and the output of the proportional integral circuit is at OV. The circuit and the home circuit are automatically restored after the fault is eliminated, which improves the continuous operation of the system. Reliability. The feedback energy of the motor brake is discharged to the bypass load resistor through the relief circuit. The direction of the power supply and the direction of the input voltage of the tachometer make the motor steering consistent with the command requirements. Adjust the speed feedback potentiometer so that the actual speed value is consistent with the command value. Through adjustment, the system can work stably in accordance with CNC instructions.
Conclusion After half a year's use of the spindle DC servo drive system, the spindle start, the braking time is significantly reduced, the rotation stability is obviously enhanced, and the speed fluctuation is within 0.2%, basically eliminating the spindle fault. Comprehensive comparison of various performance parameters is better than the old system. The spindle DC servo drive system has met the design requirements and played a certain role in promoting the production of our company's 153 piston.
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